netdev - Re: [PATCH net-next 3/3] net: mhi: Add mbim proto

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Message-ID: <CAMZdPi_-b9GWrOcj8GBX8jnxyZN9WZ6nr9KPzXPZZKWfyPW3sQ@mail.gmail.com>
Date:   Mon, 1 Feb 2021 19:27:09 +0100
From:   Loic Poulain <loic.poulain@...aro.org>
To:     Dan Williams <dcbw@...hat.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        David Miller <davem@...emloft.net>,
        Network Development <netdev@...r.kernel.org>,
        Carl Yin(殷张成) <carl.yin@...ctel.com>,
        Bjørn Mork <bjorn@...k.no>
Subject: Re: [PATCH net-next 3/3] net: mhi: Add mbim proto

On Mon, 1 Feb 2021 at 19:17, Dan Williams <dcbw@...hat.com> wrote:
>
> On Fri, 2021-01-29 at 18:21 -0800, Jakub Kicinski wrote:
> > On Wed, 27 Jan 2021 18:01:17 +0100 Loic Poulain wrote:
> > > MBIM has initially been specified by USB-IF for transporting data
> > > (IP)
> > > between a modem and a host over USB. However some modern modems
> > > also
> > > support MBIM over PCIe (via MHI). In the same way as QMAP(rmnet),
> > > it
> > > allows to aggregate IP packets and to perform context multiplexing.
> > >
> > > This change adds minimal MBIM support to MHI, allowing to support
> > > MBIM
> > > only modems. MBIM being based on USB NCM, it reuses some helpers
> > > from
> > > the USB stack, but the cdc-mbim driver is too USB coupled to be
> > > reused.
> > >
> > > At some point it would be interesting to move on a factorized
> > > solution,
> > > having a generic MBIM network lib or dedicated MBIM netlink virtual
> > > interface support.
>
> What would a kernel-side MBIM netlink interface do?  Just data-plane
> stuff (like channel setup to create new netdevs), or are you thinking
> about control-plane stuff like APN definition, radio scans, etc?

Just the data-plane (mbim encoding/decoding/muxing).

Loic